Morphological observation experiment of cockroach

Summary

This experiment is from the official website of Parasitology, School of Medicine, Shandong University.

Operation method

Morphological observation experiment of cockroach

Principle

Cockroach, commonly known as cockroach, belongs to Dictyoptera (Dictyoptera) cockroach suborder (B1attaria), cockroach family, the life history of incomplete metamorphosis, divided into eggs, larvae (wakozoa), adult three stages. The mouthparts of adult cockroach are chewing and suitable for feeding. There are two pairs of wings, the forewings are leathery, the hindwings are membranous, and the wing veins have many branches. The legs are well developed and suitable for walking. In addition to the possibility of mechanical transmission of disease, can also be used as an intermediate host for some worms (such as long membranous cestode, beautiful tube nematode, candida acanthocephalan).

Move

Morphology of cockroach life history stages (Teaching)

1. Eggs: Inside the egg pods, the number of eggs in the pods varies from a dozen to thirty. Usually it takes 1-2 months for the eggs to hatch.

2. Widow (Wakame): The newly hatched wakame is similar to the adult except that it is smaller in size, but without wings; the wakame moults 7-13 times for three months to more than a year before it turns into an adult.

3. Adult: The time required for development from egg to adult is 2-18 months. The body is oval, dorsoventrally flattened and suitable for hiding in crevices. Body color and size vary from species to species.

Head: The head is small and curved downwards, almost hidden by the prothorax, with 1 pair each of compound and single eyes. Antennæ 1 pair, slender and whip-like. Mouthparts are chewing.

Thorax: Divided into anterior, middle and posterior thorax, with a pair of forewings on the middle thorax and 1 pair of hindwings on the posterior thorax, but also not winged, with three pairs of feet on the thorax.

Abdomen: divided into eleven segments, with one pair of segmented caudal whiskers attached to the dorsal plate of the last segment. Males bear 1 pair of abdominal spines on the posterior margin of the last abdominal plate, while females do not have abdominal spines and are distinguished from males and females accordingly.

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